Camp Douglas, WI 54618 Frost Dates
Camp Douglas, WI: when does the frost end?
Around 05/01 is the usual last spring frost, about 246 days away. Fall's first freeze usually shows up around 10/03, roughly 157 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Camp Douglas in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until Camp Douglas's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Camp Douglas against the rest of the dataset
Camp Douglas's growing season runs about 157 days, ranking 33,416 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 403 of 860.
Learn more
Before leaning on 54618's figures: the frost range explains how to read the range around Camp Douglas's dates instead of trusting one, while local microclimates explains what one yard in Camp Douglas can differ from the 54618 normal.